Definition of sesqui-
1 : one and a half times sesquicentennial
2 : containing half again as many atoms sesquiterpene
3 : intermediate : combination sesquicarbonate
Origin and Etymology of sesqui-
Latin, one and a half, half again, literally, and a half, from semis half of an as, one half (probably from semi- + as as) + -que (enclitic) and; akin to Greek te and, Sanskrit ca, Goth -h, -uh
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